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macro does not find out enclosing vals


macro does not find out enclosing vals

By : subhash Patil
Date : November 22 2020, 10:56 AM
I wish this help you You don't want the Ident method that takes a symbol, you want Ident.apply, which takes a Name.
Replacing Ident(s) with Ident(s.name) (or maybe a little more clearly q"this.$s") will work.
code :


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Way to Treat Python single vals and lists of vals identically?

Way to Treat Python single vals and lists of vals identically?


By : kn88
Date : March 29 2020, 07:55 AM
it fixes the issue If the function makes sense for a single value, as well as for a list, then logically the function's result for a certain list item will not depend on the other items in the list.
For example, a and b should end up identical:
code :
items = [1, 2]
a = convert_val(items)
b = map(convert_val, items)
Loop arrays to set value = vals[0] || vals[1] || vals[2] in jQuery

Loop arrays to set value = vals[0] || vals[1] || vals[2] in jQuery


By : dhagz
Date : March 29 2020, 07:55 AM
To fix the issue you can do EDIT: It appears that you need the first truthy value from vals and bool. Here's a solution that doesn't require any functions.
code :
var value, i = 0;

while( !bool[i] && ++i < bool.length );

while( !(value = vals[i]) && ++i < vals.length );
function filterValsFromBools(bool, vals) {
    var value, i = 0;

    while (!bool[i] && ++i < bool.length);

    while (!(value = vals[i]) && ++i < vals.length);

    return value;
}

var a = filterValsFromBools(
    [true, false, true], 
    ['hi', 'med', 'lo']
);

var b = filterValsFromBools(
    [false, true, true], 
    ['hi', 'med', 'lo']
);

var c = filterValsFromBools(
    [false, true, true], 
    ['hi', 0, 'lo']
);

console.log( a, b, c );  // "hi" "med" "lo"
How can I get all object vals and subobject vals using reflection in Scala?

How can I get all object vals and subobject vals using reflection in Scala?


By : Taipan
Date : March 29 2020, 07:55 AM
Hope that helps The neat thing here is that you're using constant value definitions (i.e., final values with no type annotation; see §4.1 of the language specification), so you don't even need any mirrors:
code :
def deepMembers[A: scala.reflect.runtime.universe.TypeTag](a: A) = {
  import scala.reflect.runtime.universe._

  def members(s: Symbol): Map[String, String] =
    s.typeSignature.declarations.collect {
      case m: ModuleSymbol => members(m)
      case m: MethodSymbol if m.isAccessor => m.returnType match {
        case ConstantType(Constant(s: String)) => Map(m.name.decoded -> s)
        case _ => Map.empty[String, String]
      }
    }.foldLeft(Map.empty[String, String])(_ ++ _)

  members(typeOf[A].termSymbol)
}
scala> deepMembers(Settings) foreach println
(Name,username)
(Predicate,predicate)
(Query,query)
(Password,password)
(Protocol,protocol)
(Host,host)
How to remove the enclosing parentheses with macro?

How to remove the enclosing parentheses with macro?


By : Mohamad Rauf Ekhtiar
Date : March 29 2020, 07:55 AM
will be helpful for those in need No comma is allowed in a macro argument because it will be treated as more than one arguments and the preprocessing will be wrong. However, we can parenthesize the argument to let preprocessor treat it as one argument. Is there a macro or other techniques which can remove the enclosing parentheses?
code :
#define ESC(...) __VA_ARGS__
MY_MACRO( ESC(A<int, double>), text );
How can I get all (non-final) object vals and subobject vals using reflection in Scala?

How can I get all (non-final) object vals and subobject vals using reflection in Scala?


By : user3930049
Date : March 29 2020, 07:55 AM
it should still fix some issue Note: This question is not a duplicate of How can I get all object vals and subobject vals using reflection in Scala? , It must be a duplicate, but I need a refresher:
code :
$ scala
Welcome to Scala version 2.11.7 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0_45).
Type in expressions to have them evaluated.
Type :help for more information.

scala> object Settings { val Host = "host" ; val Guest = "guest" }
defined object Settings

scala> import reflect.runtime._,universe._
import reflect.runtime._
import universe._

scala> val im = currentMirror reflect Settings
im: reflect.runtime.universe.InstanceMirror = instance mirror for Settings$@c8e4bb0

scala> im.symbol.asClass.typeSignature.members filter (s => s.isTerm && s.asTerm.isAccessor)
res0: Iterable[reflect.runtime.universe.Symbol] = SynchronizedOps(value Guest, value Host)

scala> res0 map (im reflectMethod _.asMethod) map (_.apply())
res2: Iterable[Any] = List(guest, host)
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